28440051 has 16 divisors (see below), whose sum is σ = 39536640. Its totient is φ = 18164160.

The previous prime is 28440043. The next prime is 28440053. The reversal of 28440051 is 15004482.

It is not a de Polignac number, because 28440051 - 2³ = 28440043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28440053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8095 + ... + 11063.

It is an arithmetic number, because the mean of its divisors is an integer number (2471040).

Almost surely, 2^28440051 is an apocalyptic number.

28440051 is a deficient number, since it is larger than the sum of its proper divisors (11096589).

28440051 is a wasteful number, since it uses less digits than its factorization.

28440051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106.

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28440051 is about 5332.9214320108. The cubic root of 28440051 is about 305.2414141682.

The spelling of 28440051 in words is "twenty-eight million, four hundred forty thousand, fifty-one".